ANSWERING ALL BIO/CHEM PAPER 1 DOUBTS :)

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DOES ANYONE have the OMR SHEET?? the MCQ question paper where u fill up the circles? if u do upload them here.. thanks alottttt
 
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0610_w10_qp_11
Q) 30

In some animals, B is the allele for normal skin (without spots) and b is the allele for spotted skin.
A pair of these animals has 37 offspring, 18 with spots and 19 without.

What are the most likely genotypes of the parents?
A) BB ร— BB B) Bb ร— Bb C) Bb ร— bb D) bb ร— bb

Answer is C, someone please explain this to me very carefully? I hate these type of Qs :(
 
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That means half r spotted and half r not spotted(normal)... So the genotype of the offspring is Bb and bb so how can we achieve that... look for the 2 parent genotypes that give the offsprings Bb and bb .. so

If u cross Bb and bb u will get 2 Bb and 2 bb therefore answer is C... i know this is very complicated but these questions come all the time u have to understand them welll and revise genetics
 
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That means half r spotted and half r not spotted(normal)... So the genotype of the offspring is Bb and bb so how can we achieve that... look for the 2 parent genotypes that give the offsprings Bb and bb .. so

If u cross Bb and bb u will get 2 Bb and 2 bb therefore answer is C... i know this is very complicated but these questions come all the time u have to understand them welll and revise genetics

Got it! Cheers, but erm... you say half are spotted and half are not - even though it is 18 and 19? Or does that not matter?
 
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IGCSE Biology June 1994 Questions 4 and 23. Need explanations.
Assalam-o-alaikum wr wb...
m not sure about Q4 but 23 is here :)
june-1994-q23-jpg.12541
 
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